-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 LfEEKxWVafpHpeHnVqPxcc8sUefTuYAQh7LVNiqEdTC2mVJOVcPQAfs0I0nPj/7T
 Ak59mMu5xFcPizNWlhsRnQ==

<SEC-DOCUMENT>0001359820-10-000002.txt : 20100702
<SEC-HEADER>0001359820-10-000002.hdr.sgml : 20100702
<ACCEPTANCE-DATETIME>20100702110330
ACCESSION NUMBER:		0001359820-10-000002
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100630
FILED AS OF DATE:		20100702
DATE AS OF CHANGE:		20100702

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Ragle Brien
		CENTRAL INDEX KEY:			0001474563

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33407
		FILM NUMBER:		10934407

	MAIL ADDRESS:	
		STREET 1:		350 HILLS ST
		STREET 2:		SUITE 106
		CITY:			RICHLAND
		STATE:			WA
		ZIP:			99354

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			IsoRay, Inc.
		CENTRAL INDEX KEY:			0000728387
		STANDARD INDUSTRIAL CLASSIFICATION:	SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
		IRS NUMBER:				411458152
		STATE OF INCORPORATION:			MN
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		350 HILLS STREET,
		STREET 2:		SUITE 106
		CITY:			RICHLAND
		STATE:			WA
		ZIP:			99354
		BUSINESS PHONE:		(509) 375-1202

	MAIL ADDRESS:	
		STREET 1:		350 HILLS STREET,
		STREET 2:		SUITE 106
		CITY:			RICHLAND
		STATE:			WA
		ZIP:			99354

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CENTURY PARK PICTURES CORP
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-06-30</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000728387</issuerCik>
        <issuerName>IsoRay, Inc.</issuerName>
        <issuerTradingSymbol>ISR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001474563</rptOwnerCik>
            <rptOwnerName>Ragle Brien</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>350 HILLS ST</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 106</rptOwnerStreet2>
            <rptOwnerCity>RICHLAND</rptOwnerCity>
            <rptOwnerState>WA</rptOwnerState>
            <rptOwnerZipCode>99354</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Controller</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>1.43</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2010-06-30</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>20000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2020-06-30</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>common stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>20000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>20000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">6,666 will become exercisable on June 30, 2011, 6,666 will become exercisable on June 30, 2012, and 6,667 will become exercisable on June 30, 2013.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Brien Ragle</signatureName>
        <signatureDate>2010-07-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----
